Ogdenia mutilla (Peckham & Peckham, 1907)

Figs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 缪恐翠蛛

Rooseveltia mutilla Peckham & Peckham, 1907: 614; Prószyński 1984: 125.

Ogdenia mutilla: Peckham, 1908: 171; Prószyński 2017: 129, fig. 56 I.

Type material.

Holotype: Malaysia • ♀; Borneo, Kuching; 1 Jan. 1897; R. Shelford & Peckham leg.; MCZ: IZ: 22236, examined.

Other material examined.

China – Yunnan Province • 7 ♂♂ 2 ♀♀; Xishuangbanna Dai Autonomous Prefecture, Mengla County, Menglun Town, XTBG; 21.9080 ° N, 101.2845 ° E, 669 m a. s. l.; 21 Apr. 2023; W. Wang & Z. Yang leg.; MHBU - ARA- 00025193, 00025196, 00026514 – 00026517 • 1 ♀; same collection data as for preceding; 21.9077 ° N, 101.2824 ° E, 677 m a. s. l.; 17 Dec. 2022; W. Wang, B. Liu & Z. Yang leg.; MHBU - ARA- 00025194 • 2 ♀♀; same collection data as for preceding; 21.9108 ° N, 101.2833 ° E, 669 m a. s. l.; 2 Aug. 2021; J. Zhang, Y. Mu, K. Yu, L. Zhang & W. Wang leg.; MHBU - ARA- 00022704, 00022804 • 1 ♀; same collection data as for preceding; 21.9092 ° N, 101.2805 ° E, 605 m a. s. l.; 12 Jul. 2018; C. Jin & C. Zhang leg.; MHBU - ARA- 00020807 • 1 ♂; Xishuangbanna Dai Autonomous Prefecture, Mengla County, Wangtianshu scenic area; 21.6223 ° N, 101.5892 ° E, 700 m a. s. l.; 23 Apr. 2023; L. Wang & Q. Lu leg.; MHBU - ARA- 00025195 .

Malaysia – 1 ♂; Johor, Gunung Belemut Forest, Lata Tengkorak; 2.0550 ° N, 103.5430 ° E, 250 m a. s. l.; 16 Jun. 2019; W. P. Maddison, N. I. Morehouse et al. leg.; UBCZ .

Singapore – 1 ♀; Bukit Timah Nature Reserve, South Jungle Falls Path; 1.3551 ° N, 103.7739 ° E, 150 m a. s. l.; 5 Jun. 2019; W. P. Maddison leg.; UBCZ • 1 ♀; same collection data as for preceding; 1.3550 ° N, 103.7740 ° E – 1.3570 ° N, 103.7750 ° E, 150–160 m a. s. l.; 12–14 Jun. 2019; W. P. Maddison, N. I. Morehouse et al. leg.; UBCZ .

Vietnam – Dak Lak Province • 1 ♂; Buon Don District, Yok Don National Park; 12.8641 ° N, 107.7961 ° E, 180 m a. s. l.; 24 Apr. 2022; Q. D. Hoang leg.; TNU • 1 ♀ Krong Bong District, Chu Yang Sin National Park; 12.4796 ° N, 108.3391 ° E, 430 m a. s. l.; 14 May 2022; Q. D. Hoang leg.; TNU .

Diagnosis.

See the diagnosis of the genus.

Description.

Male. Habitus as shown in Figs 3 A – C, 4 A – G, L, 5 A, B, 6 C, D, 7 F). Measurements (MHBU - ARA- 00025193): carapace 3.27 long, 2.65 wide, abdomen 4.19 long, 2.39 wide; measurements of eyes: AME 0.55, ALE 0.31, PME 0.09, PLE 0.34; measurements of legs: I 10.52 (3.42, 1.30, 2.91, 1.80, 1.09), II 6.92 (2.20, 0.97, 1.67, 1.19, 0.89), III 7.54 (2.18, 0.90, 1.60, 1.72, 1.14), IV 10.07 (3.07, 1.03, 2.36, 2.47, 1.14); leg formula 1432. Body black and pale yellow except for blue carapace edge, covered with dense scales (Figs 3 A – C, 4 A – G, L, 5 A, B, 6 C, D, 7 F). Chelicerae claybank color, with sparse blue scales (alive) and relatively dense setae on front surface, with two promarginal and one retromarginal tooth (Figs 5 M, P – R, 6 F, 7 E). Femur I covered with short setae (Figs 4 B, E, F, 5 O). Number of teeth in each tarsal claw varied (Fig. 5 E – L).

Palp (Figs 8 A – F, 10 A, B, 11 E, 12 C – E): embolus short; cymbium yellow, longer than wide; retrolateral tibia apophysis around one-third of bulb length; palpal bulb like wax apple, with tegular bump at lower right corner.

Female. Habitus as shown in Figs 1 A, 4 H – K, 5 C, D, 6 A, B, 7 B, D. Measurements (MHBU - ARA- 00025194): carapace 3.45 long, 2.81 wide; abdomen 4.70 long, 3.04 wide; measurements of eyes: AME 0.58, ALE 0.35, PME 0.10, PLE 0.30; measurements of legs: I 8.11 (2.54, 0.96, 2.15, 1.47, 0.99), II 6.72 (2.18, 0.84, 1.62, 1.20, 0.88), III 7.71 (2.27, 0.94, 1.67, 1.87, 0.96), IV 10.5 (3.15, 0.91, 2.52, 2.87, 1.05); leg formula 4132. Body form and color pattern same as male, but without short setae on femur I. Chelicerae lacking blue scales, with slightly different shapes of teeth from males (Figs 1 C, D, 4 H, 5 S – U, 6 E, 7 A, C).

Epigyne (Figs 1 E, F, 9 A – G, 10 C, D, 11 A – D, 12 A, B): copulatory openings elongate like curved butterfly antennae; copulatory ducts short; fertilization ducts at anterior of spermathecae; accessory glands small, located close to the junction between spermathecae and copulatory ducts.

Variation.

The transition from the base of the embolus to the tegulum is smoother in some specimens (Figs 8 B, 11 E), but has an obvious junction in others (Figs 8 C, 10 A). For the females, differences in the size of accessory glands, the shape of spermathecae, copulatory openings and middle rim of epigyne are observed among different individuals (Figs 1 E, F, 9 A – E, 10 C, D, 11 A – D, 12 A, B).

Natural history.

Specimens were discovered on the surface of leaf litter or in shrubs within tropical forests (Fig. 2 A – D), moving actively and quickly. These specimens were collected during relatively dry seasons, and the subsequent lab observations showed that they may not prefer highly humid environments. While the original description of O. mutilla suggested that the species mimics Mutilla Linnaeus, 1758, a genus of parasitoid wasps (Peckham and Peckham 1907), our field observations indicated that O. mutilla possibly mimics large sympatric ants, similar to the imperfect ant-mimicry phenomenon reported in some species of Siler (Zeng et al. 2023) .

Distribution.

China, Malaysia, Singapore, and Vietnam.